It’s a well known fact that the Ameritron AL80b can obtain 1kw output ?pep?with a single 3-500. They only run 3000 volts anode voltage. ?The old Henry amps made prior to the power rule change were used in some Embassies. ?For that use they were running the same amps sold to hams. ?The Henry amps had choke input filers and 4000 volts anode and the?plate voltage was rock steady. ?Easily capable of 2kw pep output. ?Naturally the ham manuals didn’t necessarily boast that sort of power and tune up instructions were geared towards legal limits. ?Hence the CW/SSB change in voltage. ?Load to 1 kwdc input on CW Carrier) switch to SSB and talk and get 2kw pep input, but dare not let down in the SSB voltage!!! You’ll break the law. ?When the 1500 pep putput came in, away went the cw/SSB switches, not need for them anymore!!
On Friday, February 14, 2025, 12:51 PM, W7WRX <clark@...> wrote:
Which henry amps were rated at 2kw out Jim???
C
Some versions of the older Henry amps were rated for 2 kw pep out on ssb.? But they also had improved cooling and also a bigger B+ supply.?
To getter older tubes, on the drake L7,? you can use the lower (1900 vdc) position, and temp shunt out any bias ( shunt out any series diodes used for bias)...and then apply a bit ( a few watts, 10-20 watts) of drive, and maladjust the tune control to put the
tank circuit off resonance...such that both tubes show some colour.?
